I have 'blunted affect' grew up lacking facial expression.
As a child i was forever asked "whats wrong?" it annoyed me but angered my parents because they were expected to answer. I was often punished because of it, not understanding why or what i had done wrong. My parents said i was purposly refusing to smile and they were sick of it. Also the reoccuring 'i ruined photo' scenerio. Its hard to smile when you already thought you had been and harder to not think somethings wrong with you when asked daily.
Today there is not one photo of me smiling
And people still comment 'cheer up' and 'i look too serious'.